Abstract: The effects of different initial temperature, time, method and residual pressure on the minimum temperature during continuous slow hydrogenation discharge were investigated by establishing a numerical model of high-pressure gas cylinder. The results showed that temperature control is the key point of continuous hydrogenation discharge process, and the minimum temperature in the gas cylinder can be effectively controlled by appropriately increasing the initial temperature and the time of hydrogenation discharge. Compared with the first slow then fast and the stage method of hydrogenation discharge, the first fast then slow and linear method should be preferred in the hydrogenation discharge process, and these two methods have achieved good results in the minimum temperature and the control of hydrogen flow in the gas cylinder. Increasing the residual pressure of hydrogenation discharge can also increase the minimum temperature in the gas cylinderat the end of hydrogenation discharge, but reduce the quality of hydrogenation discharge to a certain extent. It is not recommended to set the residual pressure of hydrogenation discharge too high except for special requirements or scenarios.

Key words: high-pressure gas cylinder, hydrogen discharge, numerical simulation